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Line with different colors for ups and downs

Demo source

<!-- Styles -->
<style>
#chartdiv {
  width: 100%;
  height: 500px;
}
</style>

<!-- Resources -->
<script src="https://cdn.amcharts.com/lib/4/core.js"></script>
<script src="https://cdn.amcharts.com/lib/4/charts.js"></script>
<script src="https://cdn.amcharts.com/lib/4/themes/animated.js"></script>

<!-- Chart code -->
<script>
am4core.ready(function() {

// Themes begin
am4core.useTheme(am4themes_animated);
// Themes end

var chart = am4core.create("chartdiv", am4charts.XYChart);
chart.paddingRight = 20;

var data = [];
var visits = 10;
var previousValue;

for (var i = 0; i < 100; i++) {
    visits += Math.round((Math.random() < 0.5 ? 1 : -1) * Math.random() * 10);

    if(i > 0){
        // add color to previous data item depending on whether current value is less or more than previous value
        if(previousValue <= visits){
            data[i - 1].color = chart.colors.getIndex(0);
        }
        else{
            data[i - 1].color = chart.colors.getIndex(5);
        }
    }    
    
    data.push({ date: new Date(2018, 0, i + 1), value: visits });
    previousValue = visits;
}

chart.data = data;

var dateAxis = chart.xAxes.push(new am4charts.DateAxis());
dateAxis.renderer.grid.template.location = 0;
dateAxis.renderer.axisFills.template.disabled = true;
dateAxis.renderer.ticks.template.disabled = true;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
valueAxis.tooltip.disabled = true;
valueAxis.renderer.minWidth = 35;
valueAxis.renderer.axisFills.template.disabled = true;
valueAxis.renderer.ticks.template.disabled = true;

var series = chart.series.push(new am4charts.LineSeries());
series.dataFields.dateX = "date";
series.dataFields.valueY = "value";
series.strokeWidth = 2;
series.tooltipText = "value: {valueY}, day change: {valueY.previousChange}";

// set stroke property field
series.propertyFields.stroke = "color";

chart.cursor = new am4charts.XYCursor();

var scrollbarX = new am4core.Scrollbar();
chart.scrollbarX = scrollbarX;

dateAxis.start = 0.7;
dateAxis.keepSelection = true;


}); // end am4core.ready()
</script>

<!-- HTML -->
<div id="chartdiv"></div>

/* Imports */
import * as am4core from "@amcharts/amcharts4/core";
import * as am4charts from "@amcharts/amcharts4/charts";
import am4themes_animated from "@amcharts/amcharts4/themes/animated";

/* Chart code */
// Themes begin
am4core.useTheme(am4themes_animated);
// Themes end

let chart = am4core.create("chartdiv", am4charts.XYChart);
chart.paddingRight = 20;

let data = [];
let visits = 10;
let previousValue;

for (var i = 0; i < 100; i++) {
    visits += Math.round((Math.random() < 0.5 ? 1 : -1) * Math.random() * 10);

    if(i > 0){
        // add color to previous data item depending on whether current value is less or more than previous value
        if(previousValue <= visits){
            data[i - 1].color = chart.colors.getIndex(0);
        }
        else{
            data[i - 1].color = chart.colors.getIndex(5);
        }
    }    
    
    data.push({ date: new Date(2018, 0, i + 1), value: visits });
    previousValue = visits;
}

chart.data = data;

let dateAxis = chart.xAxes.push(new am4charts.DateAxis());
dateAxis.renderer.grid.template.location = 0;
dateAxis.renderer.axisFills.template.disabled = true;
dateAxis.renderer.ticks.template.disabled = true;

let valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
valueAxis.tooltip.disabled = true;
valueAxis.renderer.minWidth = 35;
valueAxis.renderer.axisFills.template.disabled = true;
valueAxis.renderer.ticks.template.disabled = true;

let series = chart.series.push(new am4charts.LineSeries());
series.dataFields.dateX = "date";
series.dataFields.valueY = "value";
series.strokeWidth = 2;
series.tooltipText = "value: {valueY}, day change: {valueY.previousChange}";

// set stroke property field
series.propertyFields.stroke = "color";

chart.cursor = new am4charts.XYCursor();

let scrollbarX = new am4core.Scrollbar();
chart.scrollbarX = scrollbarX;

dateAxis.start = 0.7;
dateAxis.keepSelection = true;